Version 0.3

This is a feature releasing for OAuth 2 server. Since this is the first release of the server implementation, you would expect that there are bugs, security vulnerabilities, and uncertainties. Try it bravely.

• RFC6749, all grant types, refresh token, authorization server.
• RFC6750, bearer token creation and validation.
• RFC7009, token revocation.
• Flask implementation of authorization server and resource protector.
• Mixin of SQLAlchemy models for easy integration.